Burglar-alarm.



PATENTED AUG. 16, 1904.

J. WHEELER. BURGLAH ALARM APPLICATION FILED OGT. 9, 1903.

N0 MODEL.

511mm mtoz 1.73/1 W11 [dz-r,

aka m4,

UNiTED STATES Patented. August 16, 1904.

JOHN WVHEELER, OF GRAND RAPIDS, MICHIGAN. v

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 767,786, dated August 16, 1904.

Application filed October 9, 1903.

To all whom it may concern..-

Be it known that I, JOHN WHEELER, a citi- Zen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification.

My invention relates to improvements in burglar-alarms; and its objects are, first, to provide a burglar-alarm that may be made to operate directly from the turning of a doorknob, and, second, to provide an alarm that may be readily applied or removed. Iattain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 shows an elevation of a section of a door-stile with the knob and alarm shown in their relative positions. Fig. 2 is the same with the cap of the bell removed and the knobshaft cut off on the line m an of Fig. 3. Fig.

3 is a side view of a knob and shaft with the trip-lever of the alarm attached. Fig. 4 is the same applied to a section of a door-stile upon the line y y of Fig. 1 and the bell attached to the stile by means of a screw directly from its center and showing a detachable trip-lever, and Fig. 5 is a side view of the shaft cut off on the line 0 a: of Fig. 3 and showing the manner of attaching the detach: able trip-lever.

Similar letters refer to similar parts throughout the several views.

In the drawings, A represents a section of a door-stile.

B represents an alarm-bell, and C represents the door-knob.

My invention consists in the manner of attaching the bell and connecting it with the shaft-socket C, which is as follows: I prefer that the bell be attached to the door-stile by means of the center screw 6, as by this means it may be readily removed, replaced, or applied when used by traveling men, &c., and when so used I provide an actuating-lever E, having an opening in the side of its hub, as at 0, so that it may be easily attached to or removed from the shaft-socket G by the proper manipulation of the thumb-screw e, which passes through the hub of the lever and against the shaft-socket C to hold the Serial No. 176A3l- (No model.)

lever firmly upon the socket. v The free end of the actuating-lever E is divided, as at 0',

so that one tine will-stand at each side of the bell-lever D, as shown in Figs. 1 and 2, and the turning of the knob will cause it to throw the bell -lever around, as indicated by the dotted lines in Fig. 2, and ring the bell, sounding an alarm that may be heard plainly'by the inmates of the house. With this construction both the bell B and the actuatinglever E can be readily removed to be carried from place to place, as the operator may desire; but when constructed in this way the hub should be made large enough to encircle the largest size of shaft-socket upon the kn obs and the thumb-screwe should be long enough to pass through and clamp the hub upon a small socket, so that the hub will be adjustable to any ordinary size of knob-shaft socket.

When the alarm is placed upon a door permanently, the bell B may be secured to the door-stile A by any of the usual means of securing such bells, and the actuating-lever E is so secured to the socket C that it may be actuated by the turning of the knob C to ring the bell, substantially as hereinbefore described, or the thumb-screw 6 may be loosened so that the socket C will turn easily in the hub of the lever E, so that the knobs may be turned without sounding an alarm.

C represents the knob-shaft, 5 represents the bell-ringers, and 6 represents a shoulder in the base of the bell, against which the back edge of the bell-lever D strikes when in its normal position in an ordinary bell of the construction shown, which can be actuated but one way from the position shown in Fig. E2- its normal position. This shoulder acts as a stop, preventing the knobs from being turned but one way, as indicated by the dotted outline of the levers D and E in Fig. 2, though the appliance will work equally as well upon a bell that will work both ways from this position, though the outfit will be much more expensive, as the bell must be made especially for it.

A decided advantage in the use of this alarm lies in the fact that when the knob (J is turned sufiiciently in the direction of the dotted lines in Fig. 2 to ring the bell the bell-lever D will come in contact With the shoulder d on the base of the bell B before the latch F has Wholly Withdrawn into the door, leaving it about the position indicated by the dotted line and in position so that the door cannot be opened, thus forming a look as Well as an alarm.

Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent of the United States, is

In combination With a door, a door-knob and shaft a bell secured to the door near the knob the bell having a short slot through one side, a lever projecting out through said slot, a lever secured at one end to the shaft and the other end projecting out and divided With one fork projecting beyond and engaging each side of the outer end of the bell-lever, and the Wall of the bell at each end of the slot aiding as a stop governing the travel of the levers substantially as and for the purpose set forth.

Signed at Grand Rapids, Michigan, October 3, 1903.

JOHN WHEELER.

In presence of C. V. CILLEY, l. J. OILLEY. 

